SU468796A1 - The method of obtaining filtering polytetrafluoroethylene film - Google Patents
The method of obtaining filtering polytetrafluoroethylene filmInfo
- Publication number
- SU468796A1 SU468796A1 SU1917808A SU1917808A SU468796A1 SU 468796 A1 SU468796 A1 SU 468796A1 SU 1917808 A SU1917808 A SU 1917808A SU 1917808 A SU1917808 A SU 1917808A SU 468796 A1 SU468796 A1 SU 468796A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- polytetrafluoroethylene film
- obtaining filtering
- polytetrafluoroethylene
- volume
- filtering
- Prior art date
Links
Landscapes
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Description
1one
Изобретение относитс к области получени фильтрующих пленок.This invention relates to the field of producing filter films.
Известен способ получени пористых изделий из политетрафторэтилена п виде пластин, труб, который состоит в предварительной термообработке порошка политетрафторэтилена на противне при температуре 324-500°С с последуюниол его дроблением и фракционированием , нрессованнн в форме и спекании. По этому способу получают пленку с диаметром пор дка от 1,85 до 12,75 ммк.A known method for producing porous articles from polytetrafluoroethylene is in the form of plates, pipes, which consists in preliminary heat treatment of polytetrafluoroethylene powder on a baking sheet at a temperature of 324-500 ° C, followed by crushing and fractionating it in mold and sintering. This method produces a film with a diameter of about 1.85 to 12.75 microns.
Целью изобретени вл етс улучшение фильтру)01цих свойств пористой политетрафторэтиленовой плепки.The aim of the invention is to improve the filter properties of the porous polytetrafluoroethylene plop.
Дл этого прессуют порошок с размером частиц от 80 до 250 ммк с об. вес. от 1,6 до 1,7 г/см, а термообработку отпрессованной затотовки провод т в замкнутом объеме, который на 15-30% больше объема заготовки.For this, a powder with a particle size of from 80 to 250 MMK with about. weight. from 1.6 to 1.7 g / cm, and the heat treatment of pressed molding is carried out in a closed volume, which is 15-30% more than the volume of the workpiece.
Пример 1. Предварительно термообработанный при 385°С в течение 5 час сырой политетрафторэтиленовый порошок подвергают дроблению и рассеву на фракции известным методом. Из фракции меньше 250 ммк ир.суют заготовку в виде полого цилиндра размером 150X50 мм и длиной 170 мм. Отпрессованную таким образом заготовку помешают в замкнутьн1 объем, ,т 3240 см1 Замкнутый объем представл ет собой цилиндрическую фор.му, закрултую с торцов и выполненную конструктивно из нержавеющей стали, Заготовку с формой liOMcnuHOT в иеч1 и провод т цикл термообработки с нагревом массы до 375°С. В результате увелнчеии объема частиц нолитетрафторзт :лсн; н гфоцессе нагрева спрессованна масса, ограпиченна объемом с незначительным коэффициентом температурного расширени , подвергаетс изостатическому давлению и спекаетс . Благодар разнице объемов заготовки и внутренней полости формы нзостатическое давление не превышает допусгн:иой велич1Н ы, достаточной дл образовапи желаемого раз,1ера нор R спеченной массе.Example 1. Pre-heat treated at 385 ° C for 5 hours, the crude polytetrafluoroethylene powder is subjected to crushing and sieving into fractions by a known method. Of the fraction less than 250 mmk, the irs are placed in the form of a hollow cylinder 150X50 mm in size and 170 mm long. The billet pressed in this way is placed in a closed volume, 3240 cm1. The closed volume is a cylindrical shape twisted from the ends and made constructively of stainless steel. The blank with the shape liOMcnuHOT is in the form 1 and is subjected to a heat treatment cycle with heating up to 375 ° WITH. As a result of increasing the volume of particles over tetrafluoride: LSN; In the heating process, the compacted mass, bounded by volume with a negligible coefficient of thermal expansion, is subjected to isostatic pressure and is sintered. Due to the difference between the volumes of the workpiece and the internal cavity of the form, the nstate pressure does not exceed the allowable: a sufficient value sufficient to form the desired times, 1 r aa r R sintered mass.
Затем охлажденную заготовку извлекаю из формы н подвергают механической обработке . Посредством строжки заготовки резцом с широкой кромкой на токарном станке получают пленку толщиной 200 ммк.Then the cooled billet is removed from the mold and machined. By gouging the workpiece with a wide-edge cutter on a lathe, a 200 mmc thick film is produced.
Проведенный аналнз пористой структуры пленкн показал, что средн ве. пор составила около 0,9 ммк.The analysis of the porous structure of films showed that it was average. pores was about 0.9 MMK.
Предлагаемым способом io.xno ПОЛУЧИ- ;. фильтрующую пленку диаметро: пор 0,2-- 0 ,8 ммк из политетрафторэтнлеиа, способную задержать на своей иоверх 1ости различные микроорганизмы н тем самым обеспечить тонкую фнльтращно нньекцнонных )астворов без температурной обрлботки нослодчпх. 3 Предмет изобретени Способ получени фильтрующей политетрафторэтиленовой пленки нутем нрессовани нредварнтельно термообработаниого порощка5 политетрафторэтилена, термической нмеханической обработки заготовки, отличающийс 4 тем, что, спелые улучшени фильтрующих свойств пленки, нрессуют порошок с размером частнц от 80 до 250 ммк с об. вес. от 1,6 до 1,7 г/см и термообработку отпрессованной заготовки осуществл ют в замкнутом объеме, который на 15-30% больще объема заготовки.The proposed method io.xno GET-; diameter filtering film: pores 0.2–0.8 mmc from polytetrafluoroethnleia, which can hold various microorganisms on its top of 1 st and thereby provide a thin fluid without solutions of temperature noslodchph. 3 Subject of the invention. A method for producing a polytetrafluoroethylene filtering film by pressing a thermotreatedly polytetrafluoroethylene layer 5, heat treating the workpiece, characterized in 4 in that ripe improvements in the filtering properties of the film press the powder from 80 to 250 microns by volume. weight. from 1.6 to 1.7 g / cm and the heat treatment of the pressed billet is carried out in a closed volume, which is 15-30% more than the volume of the billet.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU1917808A SU468796A1 (en) | 1973-04-20 | 1973-04-20 | The method of obtaining filtering polytetrafluoroethylene film |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU1917808A SU468796A1 (en) | 1973-04-20 | 1973-04-20 | The method of obtaining filtering polytetrafluoroethylene film |
Publications (1)
Publication Number | Publication Date |
---|---|
SU468796A1 true SU468796A1 (en) | 1975-04-30 |
Family
ID=20552426
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU1917808A SU468796A1 (en) | 1973-04-20 | 1973-04-20 | The method of obtaining filtering polytetrafluoroethylene film |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU468796A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5514231A (en) * | 1986-05-29 | 1996-05-07 | British Technology Group Limited | Process for producing microporous PTFE |
US6218000B1 (en) | 1995-12-01 | 2001-04-17 | Christiane Rudolf | Microporous polytetrafluoroethylene (PTFE) bodies with filler |
WO2006074001A1 (en) * | 2004-12-31 | 2006-07-13 | Boston Scientific Scimed, Inc. | Sintered ring supported vascular graft |
US7857843B2 (en) | 2004-12-31 | 2010-12-28 | Boston Scientific Scimed, Inc. | Differentially expanded vascular graft |
-
1973
- 1973-04-20 SU SU1917808A patent/SU468796A1/en active
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5514231A (en) * | 1986-05-29 | 1996-05-07 | British Technology Group Limited | Process for producing microporous PTFE |
US5677047A (en) * | 1986-05-29 | 1997-10-14 | British Technology Group Limited | Process for producing microporous PTFE |
US6218000B1 (en) | 1995-12-01 | 2001-04-17 | Christiane Rudolf | Microporous polytetrafluoroethylene (PTFE) bodies with filler |
WO2006074001A1 (en) * | 2004-12-31 | 2006-07-13 | Boston Scientific Scimed, Inc. | Sintered ring supported vascular graft |
US7806922B2 (en) | 2004-12-31 | 2010-10-05 | Boston Scientific Scimed, Inc. | Sintered ring supported vascular graft |
US7857843B2 (en) | 2004-12-31 | 2010-12-28 | Boston Scientific Scimed, Inc. | Differentially expanded vascular graft |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2440190A (en) | Preparation of nonporous polytetrafluoroethylene articles | |
US3243860A (en) | Molding methods and associated apparatus | |
GB599580A (en) | Process for the production of new and useful porous articles consisting essentially of polymers of tetrafluoroethylene | |
ATE26827T1 (en) | PROCESS FOR MAKING AN OBJECT FROM POWDERY MATERIAL BY ISOSTATIC PRESSING. | |
SU468796A1 (en) | The method of obtaining filtering polytetrafluoroethylene film | |
AU7080296A (en) | Manufacture of bodies using rice hulls | |
ATE2489T1 (en) | PROCESS FOR THE MANUFACTURE OF PRESSINGS FROM METAL POWDER. | |
ATE54266T1 (en) | PROCESS FOR PRODUCTION OF MOLDINGS BY HOT ISOSTATIC PRESSING OF METAL POWDER INTO A MOLD. | |
DE102016104661A1 (en) | Process for producing a shaped body and a latent heat storage | |
DE2458688A1 (en) | METHOD OF MANUFACTURING A MOLDED BODY FROM SILICON NITRIDE | |
Albano-Muller | Filter elements of highly porous sintered metals | |
SU477168A1 (en) | The method of obtaining porous products | |
US1863070A (en) | Process of making porous bodies | |
JPS63236621A (en) | Manufacture of molded form from defective molded form substantially constituted of polymerized unit of tetrafluoroethylene | |
SU772718A1 (en) | Method of making sintered porous articles | |
Takata et al. | Influence of Hipping Pressure on The Strength and The Porosity of Porous Copper | |
SU949918A1 (en) | Method of manufacturing caked porous articles | |
SU1715770A1 (en) | Method of preparing graphite molds for hot compaction of beryllium oxide | |
SU466013A1 (en) | The method of obtaining porous confectionery | |
SU1683865A1 (en) | Method of manufacturing filtering materials | |
SU441807A1 (en) | The method of obtaining products from secondary sintered fluoroplastic -4 with the following formulation of the subject invention | |
JPH02214647A (en) | Manufacture of ultra-high-molecular weight polyethylene porous material | |
RU2179499C2 (en) | Method for making porous products with predetermined porosity degree and configuration | |
SU1116047A1 (en) | Method of dewatering hydrolyzed peat | |
RU2052320C1 (en) | Method of making products from aluminium base alloy powder |